Fresenius Medical Care 5008, Руководство по эксплуатации

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Chapter 23: Options BLK, WET
Fresenius Medical Care 5008 OP 5/09.06 23-1
23 Options BLK, WET
23.1 To be Observed Before Using the BLK, WET Options
23.1.1 Definitions of Terms
O
BLK
Bloodline kinking and filter clotting monitoring
Detection of whether there are kinks in the blood lines between the
blood pump and the dialyzer.
Detection of whether there are clots in the dialyzer.
O
WET
Wet transductor protector
Detection of whether the venous hydrophobic filter is wet.
23.2 BLK
O
Task
If there are kinks in the blood lines or if clots are beginning to develop
in the dialyzer, this might result in a mechanically generated hemolysis.
The BLK option detects kinked blood lines between the blood pump and
the dialyzer or clots beginning to develop in the dialyzer, and emits a
warning.
O
Description
The BLK checks the extracorporeal tubing system between the blood
pump and the venous bubble catcher for changes in the flow resistance.
The BLK principle is based on monitoring the signals at the venous
pressure sensor.
The blood pump generates periodic pressure pulses. Starting at the
blood pump, these pressure pulses migrate along the tubing system
through the dialyzer and to the venous bubble catcher and are detected
in the venous pressure sensor of the dialysis system. Any change in the
pressure pulses is caused by a change in the blood flow properties in
the extracorporeal blood circuit. This, in turn, may be caused by a kink
in the tubing system or by clots developing in the dialyzer.